<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加商品</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        class="treeclass"
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color: red"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            size="mini"
            type="success"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button
            size="mini"
            type="primary"
            icon="el-icon-edit"
            @click="editGoodsCategoryClick(scope.row.cat_id)"
            >编辑</el-button
          >
          <el-button
            size="mini"
            type="danger"
            icon="el-icon-delete"
            @click="deleteGoodsCategoryClick(scope.row.cat_id)"
            >删除</el-button
          >
        </template>
      </tree-table>
      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[5, 10, 15, 20]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateFormClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormrules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- options用来指定数据源 -->
          <!-- props 用来指定配置对象 -->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentHandleChange"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <el-dialog
      title="修改分类"
      :visible.sync="editCateDialogVisible"
      width="50%"
      @close="editCateFormClosed"
    >
      <!-- 添加编辑表单 -->
      <el-form
        :model="editCateForm"
        :rules="editCateFormrules"
        ref="editCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 10
      },
      // 商品列表
      catelist: [],
      // 数据总数
      total: 0,
      columns: [{
        label: '分类名称',
        prop: 'cat_name'
      },
      {
        label: '是否有效',
        // 表示将当前列定义为模板列
        type: 'template',
        // 表示当前这一列使用的模板名称
        template: 'isok'
      },
      {
        label: '排序',
        type: 'template',
        template: 'order'
      }, {
        label: '操作',
        type: 'template',
        template: 'opt'
      }
      ],
      addCateDialogVisible: false,
      //   添加分类表单的数据对象
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        // 分类的等级，默认添加一级分类
        cat_level: 0
      },
      // 表单验证
      addCateFormrules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }]
      },
      // 父级分类的列表
      parentCateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的分类id数组
      selectedKeys: [],
      // 设置编辑分类弹窗默认为隐藏
      editCateDialogVisible: false,
      // 编辑弹窗请求数据
      editCateForm: {
        cat_name: ''
      },
      // 表单验证
      editCateFormrules: {
        cat_name: [{ required: true, message: '请输入分类名称', trigger: 'blur' }]
      },
      // 添加商品分类的id
      editCateId: '',
      // 删除商品分类的id
      deleteCateId: ''
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    //   获取商品分类
    async getCateList () {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品信息失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },
    // 监听pagesize改变事件
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pageNumber改变事件
    handleCurrentChange (pageNum) {
      this.queryInfo.pagenum = pageNum
      this.getCateList()
    },
    // 显示添加商品分类
    showAddCateDialog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    //   获取父级商品分类
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类信息失败')
      }
      this.parentCateList = res.data
    },
    // 级联选择器选择发生变化触发
    parentHandleChange () {
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        console.log(this.addCateForm)
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 点击确定按钮添加新的分类
    addCate () {
      // 表单验证
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) { // 验证失败直接return
          return
        }
        console.log(this.addCateForm)
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加父级分类失败')
        }
        this.$message.success('添加父级分类成功')
        this.getCateList()
        this.addCateDialogVisible = false
      })
    },
    // 监听添加分类关闭事件
    addCateFormClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    // 监听编辑分类关闭事件
    editCateFormClosed () {
      this.$refs.editCateFormRef.resetFields()
      this.editCateForm.cat_name = ''
      this.editCateId = ''
    },
    // 编辑商品点击事件
    editGoodsCategoryClick (categoryid) {
      this.editCateId = categoryid
      this.editCateDialogVisible = true
    },
    // 编辑商品分类提交事件
    editCate () {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.put(`categories/${this.editCateId}`, this.editCateForm)
        console.log(res)
        if (res.meta.status !== 200) {
          return this.$message.error('修改分类名称失败！')
        }
        this.$message.success('修改分类成功！')
        this.getCateList()
        this.editCateDialogVisible = false
      })
    },
    // 删除商品分类点击事件
    deleteGoodsCategoryClick (categoryId) {
      this.deleteCateId = categoryId
      this.$confirm('是否将该分类删除?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        // 确认删除
        this.confirmDelectCateInfo(categoryId)
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    },
    // 确认删除
    async confirmDelectCateInfo (categoryId) {
      const { data: res } = await this.$http.delete(`categories/${categoryId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除分类失败！')
      }
      this.$message.success('删除分类成功！')
      this.getCateList()
    }
  }
}
</script>

<style lang="less" scoped>
.treeclass {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
